The only 6 speeds I'm aware of are AWD and geared very short.
Even if you could convert an AWD 6 speed to FWD only you would likely not see much gain because of the gearing problem.
Example:
5th in a 5 Speed Impreza is 0.780
6th in a 6 Speed STI is 0.756
A real gain of 0.024.
You might have an easier time finding a taller final drive.
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